Dental drill



I. .I. FINK. DENTAL DRILL.

APPLICATION FILED DEC.26, I919.

Patented Nov. 9, 1920.

rwelztar 6% T Fi l.

tenant J. FINK, on NEW YORK, n. Y.

DENTAL DRILL.

Specification of Letters Patent.

Patented Nov. 9, 19249..

Application filed December 26,1919. Serial No. 347,484.

13' '0 all to ham it may concern lie it known that l, lsnann J. FINE, a citizen ct. the United States, residing at New York city, in the county of New York and State ot'il lew York, have invented certain new and useful improvements in Dental Drills, of which the following is a specification.

My invention relates to improvements in dental. drills, and more particularly to that class or type commonly known. as fissure loin-s.

- ltlie primary object of the invention is to provide a generally improved drill of this class which will he exceedingly simple in constructhm, cheap of manuhlcture, and etiticient in use.

A. further and very important object ot the invention is to improve the form and relative arrai'igoment ot the cutting teeth and particularly the cutting tacos thereof, to better iacilitatc the removal of the tooth substance and at thesame time pro vide ample clearance through the provision of improved longitudinallyextending grooves orliutcs and regularly spaced parallel extending grooves.

it still further object is the provision of improved teeth at the end of the cutter head,

said teeth being cut away at their rear to ailord ample clearance and direct the cuttings into the longitiulinally extending grooves or flutes.

construction, arrangement and combination of parts, hereinafter described, illustrated in some 01" its embodiments in the 2\CCOI1'1 panying drawings, and particularly pointed out in the appended claims.

Referring to the drawings, forming a part of this specification, Figure 1. is a plan view of complete dental drill constructed in accordance with this invention.

Fig. 2, an enlarged view of the cutter head in partial or semi-finished condition,

illustrating in particularthe manner of forming the regularly spaced rearwardly inclined circumferential grooves preparw tory to the final forming operation by fluting or longitudinally grooving.

Fig. 3, a similar view of the completed cutter head.

Fig. 4, an end view of the modified form shown in Fig. 7, taken on line 4- l of that figure.

Fig. 4, a sectional view of the "form shown in Fig. 3, taken on line 5-5 of that figure.

'g 45, an end view of the same taken on line (B ll thcrcot.

Fig. 7, a plan view of the modified form shown in end elevation in Fig. 4.

Similar numerals of reference designate like parts throughout all the figures of the draw in S.

grooves being inclined from the outer or free end of the cutter head, as illustrated most clearly in Fig. 2, of the drawings. The grooves 1, act to regularly space the teeth longitudinally on the cutter head as herein.- after described, and to give the teeth the proper form longitudinally.

its a means of properly spacing the teeth circumfercntially and particularly affording prope clearance for the cuttings at the rear of the cutting faces of the teeth, the cutter head is provided with properly spaced longitudinally extending grooves or flutes 1 said grooves or flutes 1 ,.bei11g so tapered as to provide tangentially arranged cutter faces 2, in the direction of rotation of the teeth 2, (see Figs. 5 and 6) and ail'ord proper clearance at the rear of the teeth. It will also be seen that the grooves 1, provide cutter faces 2 extending toward the free end of the cutter head and providing cutter edges 2, at the meeting edges of the cutter faces 2 and 2*.

'As a means of providing properly ar ranged and relatively disposed end cutters, the end teeth 2, are cut away at their rear, as at 2", such cut away or forwardly hev-- eled portionsfi at the rear of the cutters form ng communicating spaces leading to the longitudinal grooves or flutes 1, and atthan theend cutters 2 shown in Figs. 1,

fording ample clearance and at the same time forming radial end cutters 2, of superio form and arrangement. I The longitudinally extending grooves or flutes 1 are preferably turned somewhat spirally, as indicated in Fig. 3, thereby improving the form of the cutter faces 2*, and the cutting edges 2.

Referrin now to the modified form shown in igs. 4 and 7, of the drawings, it

will be seen that the grooves or flutes 1 are arranged in parallel relation with relatively straight sides and thatthe parallel grooves 1, are inclined thereby modifying the'construction and arrangement of the teeth and in such construction the drill is preferably rotated from right to left, as indicated by the arrow in Fig. 4, itbeing apparent in this instance, however, that by reversing the inclination .of' the grooves 1", a drill rotating in an opposite or right direction maybe formed. 'In such instance, it will also be observed upon reference particularlyv -to Fig. 41, of the drawings, that the radial end cutters 2 are of a different formation 3 and ,'of the drawings.

From the foregoing description, taken in connection with the accompanying drawings, the operation and advantages of my invention will be readily understood.

Having thus described some of the embodiments of my invention, without having attempted to set forth all the forms: in which it may be made or all the modes of its use, what I claim. and desire. to secure by Letters Patent, is-- 1. In a. dental drill, a cutter head embodying longitudinally and circumferentially .extending grooves forming corresponding spaced cutting teeth inclined from the free end of the cutter head and having undercut faces. I

2. In a den'taldrill', a cutter head provided with spaced tapered cutting teeth having cutter faces directed toward the outer end thereof and tangentially arranged cutter faces in the direction of rotation.

3. In a dental drill, a cutter head made up of a plurality of longitudinally and circumferentially'spaced,cutting teeth of substantially triangular shape in lon itudinal'section, the cutter' teeth attheen of said head havingcutaway portions at their rear' and having their cutting edges radially arranged from the longitudinal center of said ead.

4. In a dental drill, a cutter head aving' spaced longitudinally and 'circu lfifeaf'entially extending flutes and grooves forming corre:

spondingly spaced tapered cutting teeth,

the latter beinginclined from the point 0 the cutter head and having ends extending at right angles to the axis-o" rotation; and provided with cutter faces extending tangentially to such axis.

5. In adental drill, a cutter. head having longitudinal flutes and regularly spaced.

being inclined from the point of thecutter head and having end gutters extending atsubstantially right angles to the axial plane of rotation and provided with undercut side v faces formed tangentially to such axial plane of rotation. f

7. In a dental drill, a cutter head having longitudinally extending flutes and regularly spaced parallel extending grooves in- I clined from the front of said cutter head forming cutter teeth, the teeth at the end of said cutter head being inwardly inclined at their rearto afford clearance and directthe cuttings into said flutes and forming radial end cutters. I 8. In a dental drill, ajcutter head made up on plurality of longitudinally and circumferentially extending flutes and grooves, re

spectively, forming spaced cutting teeth jof triangularshape longitudinally and provided with tangential cutting faces, the cutting teeth at the end of said head having cutawa portions at their rear leading into said ongitudinal flutes and having radially arranged end cutters.

'Intestimony whereof I have affixed my signature. I

, ISRAEL J. FINK. 

